JPH08111919A - Cable coating stripper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sarisfactorily perform a cutting blade form a perfect slit, when a longitudinal slit is formed in a cable to be stripped and strip the cable covering. SOLUTION: A cable stripper has a cutter 12, which cuts into the insulating sheath of a cable confined between the cutter and a clamp (18, 20). The cable clamp is energized by a spring 22 in the direction of an arrow A and can be locked at a correct position by a pivoted eccentric device 28, which is so provided as to make the device 28 pulled to the retainment which locks the device 28 more firmly by a force by which the clamp is displaced in a direction opposite to the force of the spring. An alternative locking device is described in the specification.

Description

Detailed Description of the Invention

The present invention includes a handle having a cutting blade protruding from a shoulder at one end of the handle, and a cable clamp extending laterally from the end and spring biased toward the handle. It relates to a tool for removing insulation or other sheaths from such kind of electric cables (referred to herein as the kind referred to). In use, the cable is positioned between the clamp and cutter, the spring biases the cable, and the blade seals the shoulder until it contacts the sheath.
Penetrate the space. The tool is then rotated about the axis of the cable to cut the perimeter and then the tool is moved longitudinally of the cable to make corresponding slits along the sheath,
This allows the sheath to be stripped from the cable core or conductor.

The problem with this known tool is that when making a longitudinal cut, the force that needs to be applied to the handle overcomes a spring that can clamp the cable, causing the handle to cable. Inclined to a cable-inclined position rather than perpendicular to the handle (this force) tends to escape from the handle, when the cutting blade loses part of its penetration and forms an incomplete slit, Depending on the case, the peeling work may not be performed satisfactorily. The purpose of the present application is to solve this problem.

According to the invention, such a tool has a releasable detent that locks the clamp in its position against movement at least in the direction opposite to the direction biased by the spring.

Locking the clamp against movement in both directions would be within the scope of the invention, but it is presently preferred to allow spring-biased movement and simply prevent opposite movement.

Conveniently, the releasable detent includes a member displaceable between an effective position and an ineffective position, and in the ineffective position, the clamp is displaced against the spring, Allows the cable to be inserted between the cutter and the clamp.

[0006] Preferably, the means includes a sprag tooth which is movable on the clamp to engage or disengage the ratchet tooth with the cut rack. This ratchet can be moved in one direction by raising and reengaging the chocks. However, by making the teeth like saw teeth, this motion will prevent movement in both directions.

In the drawings, and in particular in FIG. 1, the tool has a shouldered carrier at one end of the handle.
It includes a handle 10 provided with a cutter blade 12 protruding from 14.

The cable clamp includes a strip-like portion 16 with laterally extending portions 18, 20 overlying the cutter. The strip-like portion is guided through a slot in the body 10 and biased in the direction of arrow A by a tension spring 22. The cable clamp can be moved in the opposite direction of arrow A against the spring, and when the force causing the movement is released, the spring will move to the cutter.
It is recognized that the cable near the associated location 24 is biased to be penetrated by the blade 12.

According to the invention, the strip 16 comprises a pin 3
A laterally extending ratchet tooth is provided on a surface 26 proximate to a locking cam 28 that is pivoted above the zero and provided with a wheel stop tooth. The pivot is eccentric and the cam is from the position shown, completely spaced from engagement, to the position where the ratchet teeth engage the rack to prevent movement of the clamp in the direction opposite arrow A. And is arranged to allow a spring-driven movement in the direction of arrow A, on the one hand.

It will be appreciated that the profile of this arrangement aids this operation. The spring tends to pull the strip in the direction that causes the cam to pivot to the released position, while the arrow A
Rotate the cam so that it does not move further by moving the part in the opposite direction.

Referring now to FIG. 2, a modification of the arrangement of FIG. 1 is shown in which the cam 28 is replaced by a sliding lock 40 which has a longitudinal groove which engages a guide rib 44, The guide ribs are inclined and lock 40
The set of locking teeth 46 is moved into engagement with the teeth 48 on the portion 16 when the is slid along the length of the ribs. The inclination of the ribs 44 is such that any force tending to move the cable clamp away from the cutter will also cause the slider to move.
It will be appreciated that it has been redirected to try to pull it further into wedge engagement.

In FIG. 3, locking is accomplished by a cam 50 having a serrated portion 54 that is pivoted at a point 52 and fixed (ie, non-rotatable with respect to the cam). The locking movement includes a clockwise movement of the cam, and again the force resisted by the lock tends to pull the lock more firmly into the position resisting unwanted movement of the cable clamp.

In FIG. 4, the lock is provided by a spindle 60 which is angled by a control knob 62 which is threadedly engaged with the body of the device, and in the particular embodiment shown in this figure the screw is It is provided on the inserted nut 64. Locking and releasing is accomplished by turning the knob a fraction of a full turn in either direction, with the appropriate thread pitch.

In FIG. 5, the arrangement is a slip lock 40.
2 is similar to FIG. 2 except that it has a one-piece cam 142 that moves parallel to the part 16 and displaces the metal pawl 144 and engages the free end of the pawl within the tooth 48. Part 1
A leaf spring 44 is enclosed in the tool body. Part 150 is a pivoted holder for the spare cutting blade 12.

[Brief description of drawings]

1 is an elevational sectional view of a tool according to the present invention.

FIG. 2 is a more fragmentary, similar drawing of another embodiment.

FIG. 3 is a more fragmentary, similar drawing of another embodiment.

FIG. 4 is a more fragmentary, similar drawing of another embodiment.

FIG. 5 is a more fragmentary, similar drawing of another embodiment.

[Explanation of symbols]

 10 Handle 12 Cutter Blade 14 Carrier 16 Strip Part 18 Lateral Part 20 Lateral Part 22 Extension Spring 24 Related Position 26 Surface 28 Locking Cam 30 Pin 40 Sliding Lock 42 Groove 44 Guide Rib 46 Locking Tooth 48 Tooth 50 Cam 52 Pivot point 54 Serrated portion 60 Spindle 62 Control knob 64 Nut 140 Sliding lock 142 Cam 144 Leaf spring 150 Holder

Claims (8)

[Claims] 1. A cable sheath removing tool, a cutter blade, a cable clamp capable of adjusting a position for holding the cable with respect to the blade, and a clamp held in the position. And a releasable locking means for the tool. 2. The tool of claim 1, wherein the locking means is adapted to hold the clamp against movement in one direction and the spring means biases the clamp in opposite directions. tool. 3. The tool of claim 1, wherein the locking means is adapted to hold the clamp against movement in two opposite directions. 4. The tool of any of the preceding claims, wherein the locking means comprises a spindle threadably engaged with a nut, the end of the spindle being advanced to engage a portion of the clamp. Characteristic tool. 5. A tool according to any one of claims 1 to 3, wherein the lock includes a portion pivoted for angular movement between a locked position and a released position. 6. The tool of claim 5, wherein the pivot is arranged such that a force acting in one direction tends to bias the engagement of the lock to a greater degree. 7. A tool according to any of the preceding claims, wherein the cable clamp comprises a strip portion which is slidably guided in the handle in which the cutter is mounted, the strip portion being a locking means. A tool having a saw-tooth shape for engaging with. 8. The tool of claim 7, wherein the locking means includes a portion substantially parallel to the strip and directed against engaging and disengaging movement thereof. .